Desmodium heterophyllum (Willd.) DC.

Himalaya, Ceylon, India, S.E. Asia, China, Malaysia, Pacific Is., Australia.

200 m

Perennial, Herbs, Stems woody below, or from woody crown or caudex, Taproot present, Nodules present, Stems prostrate, trailing, or mat forming, Stems less than 1 m tall, Stems solid, Stems or young twigs sparsely to densely hairy, Stems hairs pilose or spreading, Leaves alternate, Leaves petiolate, Stipules inconspicuous, absent, or caducous, Stipules conspicuous, Stipules green, triangulate to lanceolate or foliaceous, Stipules deciduous, Stipul es free, Leaves compound, Leaves pinnately 3-foliolate, Leaves odd pinnate, Leaf or leaflet margins entire, Leaflets opposite, Stipels present at base of leaflets, Leaflets 3, Leaves hairy on one or both surfaces, Inflorescences racemes, Inflorescence axillary, Bracts very small, absent or caducous, Bracteoles present, Flowers zygomorphic, Calyx 2-lipped or 2-lobed, Calyx hairy, Petals separate, Corolla papilionaceous, Petals clawed, Petals pinkish to rose, Banner petal ovoid or obovate, Wing petals narrow, oblanceolate to oblong, Wing tips obtuse or rounded, Keel tips obtuse or rounded, not beaked, Stamens 9-10, Stamens diadelphous, 9 united, 1 free, Filaments glabrous, Style terete, Fruit a loment, jointed, separating into articles, Fruit unilocular, Fruit tardily or weakly dehiscent, Fruit indehiscent, Fruit elongate, straight, Fruit exserted from calyx, Fruit compressed between seeds, Fruit hairy, Fruit 3-10 seeded, Seeds ovoid to rounded in outline, Seeds reniform, See d surface smooth, Seeds olive, brown, or black.

Hàn the (danh pháp hai phần: Desmodium heterophyllum), còn gọi là sơn lục đậu, là một loài thực vật thuộc phân họ Đậu (Faboideae).

异叶山蚂蝗（学名：Desmodium heterophyllum），又名變葉山螞蝗、铁线草，为豆科山蚂蝗属下的一种平卧草本植物。長度可達70釐米。入肝經，有清热解毒、利尿通淋的功效。